/****************************************************************************
 * net/bluetooth/bt_att.c
 *  Bluetooth UUID handling.
 *
 *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Ported from the Intel/Zephyr arduino101_firmware_source-v1.tar package
 * where the code was released with a compatible 3-clause BSD license:
 *
 *   Copyright (c) 2016, Intel Corporation
 *   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <string.h>
#include <errno.h>

#include <tinyara/bluetooth/bt_uuid.h>

/****************************************************************************
 * Private Data
 ****************************************************************************/

/* TODO: Decide whether to continue using BLE format or switch to RFC 4122 */

static const struct bt_uuid_s g_uuid128_base = {
	.type = BT_UUID_128,
	.u.u128 = {
		0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80,
		0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
	}
};

/****************************************************************************
 * Private Functions
 ****************************************************************************/

static void uuid_to_uuid128(FAR const struct bt_uuid_s *src, FAR struct bt_uuid_s *dst)
{
	switch (src->type) {
	case BT_UUID_16:
		*dst = g_uuid128_base;
		memcpy(&dst->u.u128[2], &src->u.u16, sizeof(src->u.u16));
		return;

	case BT_UUID_128:
		memcpy(dst, src, sizeof(*dst));
		return;
	}
}

static int uuid128_cmp(FAR const struct bt_uuid_s *u1, FAR const struct bt_uuid_s *u2)
{
	struct bt_uuid_s uuid1;
	struct bt_uuid_s uuid2;

	uuid_to_uuid128(u1, &uuid1);
	uuid_to_uuid128(u2, &uuid2);

	return memcmp(uuid1.u.u128, uuid2.u.u128, sizeof(uuid1.u.u128));
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

int bt_uuid_cmp(FAR const struct bt_uuid_s *u1, FAR const struct bt_uuid_s *u2)
{
	/* Convert to 128 bit if types don't match */

	if (u1->type != u2->type) {
		return uuid128_cmp(u1, u2);
	}

	switch (u1->type) {
	case BT_UUID_16:
		return (int)u1->u.u16 - (int)u2->u.u16;

	case BT_UUID_128:
		return memcmp(u1->u.u128, u2->u.u128, sizeof(u1->u.u128));
	}

	return -EINVAL;
}
